forkel



(No Model.)

2 Sheets-Sheet I. F. W. PORKBL & A.B .IHU N-N.

LOGK.

1m 438,803. Patentd Oct. 21, 1 890.

Maw

Wrn/Mwem zzziiw- (No Model.) 2 Sheets-Sheet 2. F. W. PORKEL & A. B. HUNN.

LOCK.

No. 438,803. Patented Oct. 21, 1 89-0.

Witw'amvem UNITED STATES PATENT OFFICE.

FREDERICK W. FORKEL AND ALBERT B. HUNN, OF CLEVELAND, OHIO, AS-

SIGNORS TO THE PERKINS LOCK MANUFACTURING COMPANY, OF SAME PLACE.

LOCK.

SPECIFICATION forming part of Letters Patent No. 438,803, dated October 21, 1890. Application iiled March 13, 1890. Serial No. 343,764: (No model.)

vriety is fulcrumed on the racking-stump of the bolt, the one arm of such lever being adapted to engage and withdraw the latch, and the other arm of the lever being adapted to engage the key after the bolt shall have been withdrawn by turning the key still farther in the same direction that withdrew the bolt;

In the accompanying drawings, Figures 1, 2, and 3 are side elevations of the lock with the cover removed, showing different working positions of the parts. Fig. 4 is an end elevation of the lock. Figs. 5 and 6 are plans in detail, respectively, of one of the tumblers.

and of the bell-crank lever, showing the reverse side of the latter.

A represents the casing of the lock, and A the removable cover thereof.

B represents the bolt; C, a tumbler, of which there may be any desired number, and D the latch.

E is the knob-spindle, provided in the usual manner with cam-hub E, that actuates hublever e. The latter has a lug 6, operating in a slot d of the latch, and by turning the knobspindle in either direction lug e, by engaging the inner end wall of slot d, withdraws the latch. Hub E is provided with a recess E for receiving the inner end of the locking slide F, by means of which hub E may be locked so that the latch cannot be withdrawn by operating the knob-spindle.

G is a hub, having an arm G adapted to operate in notch f of locking-slide F. Hub G connects with spindle g, the latter being provided on the inside of the door with thumbturn g, by manipulating which the slide is shifted, whereby the knob-spindle and attachments are locked or unlocked; also, on the im side of the door is a thumb wheel or knob or thumb-turn H, as the case may be, mounted on spindle H. This spindle inside the lock is provided with an arm h, adapted to engage.

by engaging the end walls of slot 17, serving as a stop to limit the movement of the bolt in either direction. The tumblers are provided with openings C, known ,as racks, in which operates lug b of the bolt, this lug being known as the racking-stump. The tumblers lock the bolt, except the tumblers be raised by the key so that slots 0 of the tumblers are opposite the stump of the bolt. Upon the racking-stump b is fulcrumed lever I, of the bell-crank variety, the long arm I thereof being adapted to engage lug d of the latch, whereby the latch may be withdrawn by actuating the lever. The short arm I of the bellcrank lever is out of the way of keyK in shooting or withdrawing bolt B; but the kolt having been withdrawn and the parts being in the position shown in Fig. 2, arm I is in position to engage the key if the latter be turned far enough in the same direction that withdrew the bolt. The tumblers are provided with spaces or racks c, in which operates lug i of the bell-crank lever, and connecting with rack c is a notch 0, into which lug '5 may retire when the tumblers, by engagement with the key, shall have been elevated so as to bring notches c opposite lug 2'. With the positionof parts shown in Fig. 2, the bolt having been withdrawn by turning the key, the latter is turned still farther in the same direction, whereupon the wards of the key first engage the tumblers and elevate the latter so that notches c are opposite lug i, and a further movement of the key in the same direction actuates lever I in the direction to withdraw the latch. It will be seen, therefore, that the knob-spindle having been locked the party having the key can from the outside of the door not only withdraw the bolt, but by a farther movement of the key in the same direction canalso withdraw the latch and open the door.

Many of the minor details of the lock are omitted in the description because of their being so well known.

What I claim is- 1. In a lock, the combination, with a latch and a bolt provided with tumblers, of a lever mounted on the racking-stump of the bolt, the one arm of the lever being adapted to engage the latch, and the other arm of the lever being adapted to engage the key, the arrangement being such that the lat-ch is withdrawn by a further movement of the key in the same direction that withdrew the bolt, substantially as set forth.

O. H. DORER, G. H. ROBBINS. 

